<!DOCTYPE html>
<html lang="zh-cmn-Hans">

<head>
    <!-- Required meta tags -->
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no" />
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="../bootstrap-4.5.0-dist/css/bootstrap.min.css">
    <title>按钮的技巧</title>

    </style>
</head>

<body>

    <button>普通按钮</button>
    <button class="btn">btn:按钮属性</button>
    <button class="btn btn-primary">btn-primary:蓝色按钮</button>
    <button class="btn btn-danger btn-sm">btn-danger:红色按钮 btn-sm:小按钮</button>
    <button class="btn btn-success btn-lg">btn-success:绿色按钮 btn-lg:大按钮</button>

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="../bootstrap-4.5.0-dist/others/jquery-3.5.1.min.js"></script>
    <script src="../bootstrap-4.5.0-dist/others/popper.min.js"></script>
    <script src="../bootstrap-4.5.0-dist/js/bootstrap.min.js"></script>
</body>

</html>